• 责任者：Xie Wei (State Key Laboratory of Ore Deposit Geochemistry ; Institute of Geochemistry ; Chinese Academy of Sciences ; Guiyang 550002 ; China) ; Song Xieyan
• 刊名：Acta Petrologica Sinica
• 出版年：2013
• 卷期：29(10)
• 关键词：铜矿 ; copper ores ; 镍矿 ; nickel ores ; 甘肃 ; Gansu Province
• 页码：p.3487-3502
• 图表：8 illus., 2 tables, 67 refs.
• 分类号：1001
• issnNo：ISSN1000-0569
• isbnNo：CN11-1922/P

     The Heishan intrusion hosting Ni-Cu-（PGE） sulfide deposit is located in the eastern of the Beishan Fold Belt at the southern margin of the Central Asian Orogenic Belt （CAOB）. Studying the intrusion is helpful for learning the genesis of the orogentype Ni-Cu-（PGE） sulfide deposit. The detailed field geology indicates that only Neoproterozoic strata but no Cambrian occur in the Heishan area. The dominant rocks of the intrusion are harzburgite and lherzolite. Olivine gabbronorite and gabbro dyke occur only along the southern margin of the intrusion. The Heishan intrusion was originally sill-like and was tilted to the south east on the south limb of an anticline formed during following collisional orogeny. The Fo of olivine from the Heishan samples is from 80. 5 to 87.0 with 1070 x 10^-6 -3461 x 10^-6 Ni. We further improve the Heishan calculated parent magma is a high-Mg basaltic magma （12. 81% MgO, 10. 84% FeO, 430 x 10^ -6 Ni ）. The olivine data of Heishan indicate that they are controlled by 1 ） the composition of the parent magma; 2） mixed melt by latter ascending fresh magma; 3 ） the sulfide segregationi 4）： the trapped liquid shift; 5 ） Fe-Ni exchange between olivines and sulfide liquids. Our calculation implies that sulfides began to segregate as the same time as olivine crystallization, and the minimum ratio of olivine ： sulfide was 20 ： 1. Olivines from No. 1 ore body and mineralization bodies contain richer Mg and Ni than those from No. 4 ore body, and show negative correlations between Ni and Fo. It indicates that not only the olivines from No. 1 ore body and mineralization bodies occur Fe-Ni exchange with sulfide liquids which contain more enriched Ni, but also the concomitant magmas with the sulfide liquids were more primitive. It is because the Heishan intrusion was formed in a magmaic plumbing system, the early sulfides reacted with the latter fresh magma and occurred upgrading and enrichment and formed t＇he No. 1 ore body and mineralization bodies.